/**
* Copyright 2010 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.base.evaluators;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.HashMap;
import java.util.Map;
import org.drools.base.ValueType;
import org.drools.spi.Evaluator;
/**
* A simple helper class to store Evaluators for a given set of
* value types and operators
*
* @author etirelli
*/
public class EvaluatorCache implements Externalizable {
private static final long serialVersionUID = 510l;
private Map<ValueType, Map<Operator, Evaluator>> evaluators = new HashMap<ValueType, Map<Operator, Evaluator>>();
public EvaluatorCache() {
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
Map<ValueType, Map<Operator, Evaluator>> temp = (Map<ValueType, Map<Operator, Evaluator>>)in.readObject();
for (Map.Entry<ValueType, Map<Operator, Evaluator>> entry : temp.entrySet()) {
evaluators.put(ValueType.determineValueType(entry.getKey().getClassType()),
entry.getValue());
}
}
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(evaluators);
}
public void addEvaluator( final ValueType type, final Operator operator, final Evaluator evaluator ) {
Map<Operator, Evaluator> opEvalMap = this.evaluators.get( type );
if( opEvalMap == null ) {
opEvalMap = new HashMap<Operator, Evaluator>();
this.evaluators.put( type, opEvalMap );
}
opEvalMap.put( operator, evaluator );
}
public Evaluator getEvaluator( final ValueType type, final Operator operator ) {
Map<Operator, Evaluator> opEvalMap = this.evaluators.get( type );
return opEvalMap != null ? opEvalMap.get( operator ) : null;
}
public boolean supportsType(ValueType type) {
return this.evaluators.containsKey( type );
}
}